POWER AMPLIFIER NON LINEARITES AND PRE-CORRECTION MODULE IMPACT ON DVB-T2 OFDM TRANSMITTER SYSTEM

Modulation Error Rate (MER) is one of the metrics for evaluating Orthogonal Frequency Division Multiplexing (OFDM) transmitter signal quality. Due to high number of sub-carriers of any OFDM transmitter and the high amplitude differences of symbol - to - symbol modulating each sub-carrier, high Peak to Average Power Ratio (PAPR) is common. This paper deals with a real system setup of measuring MER of a DVB-T2 transmitter (Digital Video Broadcasting - Second Generation Terrestrial) operating in Albania territory. The focus is in analyzing transmitter behavior on different power amplifier gain, measuring in-band and out-band signal quality and spurious emission. The importance of pre-distortion is drowned for DVB-T2 transmitters and extended as a conclusion to a more generic OFDM transmitters.